Protective relay methods and apparatus

Details Protective relay methods and apparatus Protective relay methods and apparatus

H - Electricity

02

H

348/24

H02H 7/045 (2006.01) H02H 3/16 (2006.01) H02H 3/28 (2006.01)

Patent

CA 1200594

19 ABSTRACT OF THE DISCLOSURE Differential protective relay methods and appa- ratus which include a differential current function super- vised by both a harmonic restraint function and a voltage- change function. The voltage change function determines whether or not the differential current function requires harmonic restraint supervision, preempting such super- vision when it is not required, to enable faster trip decisions to be made by the differential current function.

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